Downgrade ubuntu version in docker static build #5805

Job	Run time
Build test artifacts (postgres)	47m 25s
Build test artifacts (sqlite)	47m 10s
Build test binaries	13m 32s
demo-native	2m 16s
test-sqlite (1)	2m 38s
test-sqlite (2)	3m 39s
test-sqlite (3)	6m 44s
test-sqlite (4)	2m 24s
test-sqlite (5)	3m 34s
test-sqlite (6)	3m 13s
test-sqlite (7)	4m 13s
test-sqlite (8)	2m 57s
test-sqlite (9)	2m 21s
test-sqlite (10)	2m 37s
test-integration (2)	3m 19s
test-integration (99)	11m 24s
test-postgres (1)	2m 34s
test-postgres (2)	3m 21s
test-postgres (3)	4m 2s
test-postgres (4)	1m 57s
test-postgres (5)	4m 15s
test-postgres (6)	1m 24s
test-postgres (7)	4m 39s
test-postgres (8)	1m 55s
test-postgres (9)	2m 43s
test-postgres (10)	2m 11s
	3h 8m 27s

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